So my Sound script is working fine in studio but in actual game it doesn't work?

So I'm here again asking questions, I have encountered a game problem my local script in startercharacterscript

local player = game.Players.LocalPlayer
local Character = player.Character
local RootPart = Character.HumanoidRootPart
local Sound = RootPart:WaitForChild("Running", 10)
local Landing = RootPart:WaitForChild("Landing", 10)
local Died = RootPart:WaitForChild("Died", 10)
Sound.Volume = 3
Landing.Volume = 20
Died.SoundId = "rbxassetid://4494920504"
Died.Volume = 2

it makes the footstep louder, landing louder and Died's custom sound it works perfectly fine in studio but in the actual game, it doesn't how can I fix this problem?